我看不靠谱，你瞧那河马，整天在水里游啊游的，就没见它苗条过，我还是想想别的法子吧。
wǒ kàn bù kàopǔ ，nǐ qiáo nà hémǎ ，zhěngtiān zài shuǐ lǐ yóu ā yóu de ，jiù méi jiàn tā miáotiáo guò ，wǒ háishì xiǎngxiang biéde fǎzi ba 。
I don't think that's very reliable. Look at the hippo. It spends every day swimming about, and I've never seen it slender. I should really think of something else.